NDLI: Inhibition of T-cell reactivity to myasthenogenic epitopes of the human acetylcholine receptor by synthetic analogs.

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Inhibition of T-cell reactivity to myasthenogenic epitopes of the human acetylcholine receptor by synthetic analogs.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Sela, M. Mozes, E. Katz-levy, Y. Kirshner, S. L.
Description	Author Affiliation: Katz-Levy Y ( Department of Chemical Immunology, Weizmann Institute of Science, Rehovot, Israel.);
Abstract	The synthetic peptides p195-212 and p259-271, representing amino acids 195-212 and 259-271 of the alpha subunit of the human acetylcholine receptor, preferentially stimulate T cells of patients with myasthenia gravis and are immunodominant T-cell epitopes in SJL and BALB/c mice, respectively. We designed and synthesized analogs of these peptides that contain single amino acid substitutions. An analog of peptide p195-212, no. 455 (Met-207-->Ala), was capable of inhibiting up to 100% of the proliferative responses of a p195-212-specific T-cell line originating from the high-responder strain SJL. Similarly, an analog of p259-271, no. 306 (Glu-262-->Lys), was capable of inhibiting up to 93% of the proliferative responses of the p259-271-specific T-cell line originating from high-responder BALB/c mice. Analog 306 also inhibited up to 43% of the proliferative responses of p259-271-primed lymph node cells in an in vitro proliferation assay. To test the in vivo inhibitory activity of the analogs, mice were primed with the myasthenogenic peptides in complete Freund's adjuvant concomitant with administration of the analogs in aqueous solution. Administration of analogs 455 and 306 led to decreased proliferative responses of up to 70% by peptide p199-212-primed lymph node cells and up to 85% by peptide p259-271-primed lymph node cells. Similar results were obtained whether the analogs were administered i.v. or i.p. Thus, these analogs are good candidates for specific immunomodulatory therapy for patients with myasthenia gravis.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	15
Volume Number	90
Language	English
Publisher	National Academy of Sciences
Publisher Date	1993-09-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Myasthenia Gravis Immunology Receptors, Nicotinic T-Lymphocytes Amino Acid Sequence Animals Epitopes Immunosuppression Lymph Nodes Lymphocyte Activation Mice Mice, Inbred Strains Molecular Sequence Data Peptides Chemistry Structure-Activity Relationship Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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